started shooting rounds into the suv and then took off to follow the suv. but there were a bunch of cops that stayed back to tend to the first suspect. >> when he ran over his brother, what happened? did he drag him? >> yeah, about 20 feet.

>> about 20 feet he dragged his own brother. >> yeah. >> down the street. what were you guys doing? were you alone at the time? >> my roommate and his girlfriend were in the third floor with me. and my roommate and i were at the woeindow and his girlfriend was in the other room. >> your reaction? >> shock, awe, nervous, anxious, the whole realm, really. >> yeah. unbelievable. and what do they do once the car got away -- you said they were shooting rounds at the car. the police who were there on the scene, did they attend to the other person or was he too far away? >> they attended to the transit officer that was down -- they got him in the ambulance within a matter of minutes. and then about ten or so minutes later, they had an ambulance at the scene for the suspect. >> curtis, thank you. >> thank you, don. >> really appreciate you joining us. thank you so much. remembering one of their own.

police, fire and first responders are lining the streets of boston tonight paying a silent tribute to fallen m.i.t. police officer sean collier. officials say for no obvious reason the tsarnaev brothers shot and killed collier while he was sitting in his cruiser thursday night. it was a wild shootout between the suspect and police left transit officer richard donohue seriously injured. coincidentally collier and donohue graduated from the police academy together. cnn's poppy harlow is in wilmington for us now. such a sad story. you spoke to some of the people who were close to officer collier, some of his close friends. >> reporter: i did. it was an amazing scene that unfolded behind us this evening.

it was the vigil for that gunned-down police officer, sean collier. we were there when that motorcade left boston medical center and brought his body out here to -- i would say, i don't know, over 500 people at least from this community, fellow police officers, et cetera, coming to honor this 26-year-old hero that we're told by so many people, all he wanted to do was be a police officer. and he did realize that dream. tonight we heard from his brother, andrew, also his stepfather, his boss, the police chief at m.i.t. many people talking about their best memories of this man. after the vigil, we had a chance to speak one-on-one with the man that knows collier very well, m.i.t. police chief john defava. and he discussed with me just how much this young man meant to m.i.t., meant to the entire community. really gives you a sense of the quality of person he was. listen.

>> i believe he had the calling. he just wanted to be in law enforcement. it wasn't about the pay or the benefits or the retirement. it was about what law enforcement was supposed to be all about, that's to help people. he was a master at helping people. i think m.i.t. lost someone that truly cared about their community. and i think we lost someone that we learned more from him than he ever learned from us. >> reporter: at 26 years old. >> at 26 years old. >> reporter: says a lot. >> i've been a cop for almost 40 years. you see a lot. you really do. i just never saw anything like this. it's heartbreaking. everything about it is just wrong. killing him was senseless, the loss of a person of his quality, his age, the fact that it happened on a college campus. everything about this is wrong.

>> reporter: and, don, also tonight, we talked to three m.i.t. students that are alalso emts and they were close friends of collier. they came with flowers and messages for his family. interestingly what we learned is they not only were close friends of his, but they were the three emt -- student emts on campus that had to respond to the call after his shooting and go to collier. incredibly, incredibly difficult for them to handle. unimaginable, don. but a very sad night. but a night honoring this young man as well. >> i can only imagine. poppy harlow, thank you very much for that. straight ahead, the final moments before last night's capture. inside information, a moment-by-moment breakdown of how police captured tsarnaev. is our business. we've reduced taxes and lowered costs to save

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they do have him cornered right now. they have the suspect. they believe it is the suspect. >> we heard what appeared to be several shots. that sounds dimpbtd thfferent t flash bang. it was definitely shots being fired. >> this is cnn breaking news. >> if you're just joining us, good evening, everyone. what started about 23 hours ago now seems to be finally over. the last suspect, the search, that suspect is now in custody. >> today, the city of boston, the city of cambridge and the city of watertown and many other communities can breathe a sigh of relief knowing two perpetrators who caused so much pain and anguish are no longer a

threat to our personal safety and to our communities. >> i want you to hear more now from the chief of police in watertown. that's a suburb of boston where that massive police dragnet finally closed in on dzhokhar tsarnaev and he was finally taken down. >> when did you realize that this was going down, that you had the second suspect? >> it was late in the day. we had a report that we got from our citizens. we asked them to keep vigilant. we got the call. sounded like really good information. >> that person called and said, there's a guy in this boat in my back yard? >> that's right. >> and it looks like there's blood there. >> right. >> pick up the story. >> at that point, we had a couple thousand police officers on scene. the support we got from the state and from the region. we had the tactical people to be able to close that scene down

and secure it. we did take our time to make sure that everybody was safe in the neighborhood. eventually we had to use some flash bangs to render the subject -- >> tell the viewers what a flash bang is. >> it's a loud compression that would stun somebody for a short period of time. we began negotiations, slowly over a 15, 20-minute period we were able to get them to stand up and show us that he didn't have a device on him. >> he's lying in this boat. he's been there for several hours. he's wounded clearly. he's bleeding. >> he's obviously weak. you come over there. what do you say to him? you have a bullhorn and you say, come out with your hands up? >> we have a negotiator who was on the second floor of the house looking down at the boat -- >> you could see him? >> we couldn't see him. there was a plastic top over it but we had the state police helicopter that could tell us when there was movement in the boat by the heat sensor. we could tell he was alive and

moving. we began the negotiations that way. over a long period of time, we were able to finally get him to surrender without any other -- anybody hurt -- >> he didn't use any more gunfire while he was in the boat -- >> there was early gunfire when we first got in the area. he exchanged gunfire with some of the officers. then we secured the scene and there was no more gunfire after -- >> what kind of weapon did he have? >> we're not sure. the crime scene is still live down there. the fbi crime scene search is there now. we don't know what's in that boat. there could be devices -- >> because the fbi is in charge of that? >> yes. >> did he have an explosive vest on his body like his older brother did like the night before? >> that was our major concern. that's why no one wanted to go near him until we needed to get him to understand he needed to lift his shirt up -- >> did he do that? >> eventually over a long period of time.

20 to 30 minutes. >> he had no explosives with him in the boat -- >> we haven't got into that boat. it's a decent size boat. we don't know what else is in there. he needed first aid. he was transported by ambulance into a boston hospital. >>. two brothers accused of committing such terrible crimes. why? we'll get some insight on the so-called sibling effect next. baked in a ketchup glaze with savory gravy and mashed russet potatoes. what makes stouffer's meatloaf best of all? that moment you enjoy it at home. stouffer's. made with care, for you or your family.

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their adopted home? their uncle thought he knew why. >> again, i say what i think what's behind it. being losers, not being able to settle themselves. and thereby just hating everyone who did. >> losers. is it as simple as that, as simple as being a loser, or was there something more in their heads that led them to such a tragic end? wendy walsh joins me now. wendy, what do you think? what drove these young men to commit such an atrocity? will we ever know? >> we may never know. but there are certainly lots of possibilities. these are two young men, there may have been a power dynamic with an older brother, younger brother. they may have felt culturally isolated. despite the fact they've been in the country ten years, the older brothers was known who have said he has no american friends. and then this search for identity that teenagers and

young adults seek out and turning to the extreme parts of a muslim religion. i must stop here to add that i think one of the biggest tragedies here is that good muslim americans again are in the news and there is misinformation about this religion because what these guys were practicing is not what 99.99% of muslims would ever practice. but there's a search of identity. when you carry this cultural duality, there is sometimes -- the pendulum may sing too far to an extreme place. >> they're practicing not religi religion. they're practicing extremism. i think understands what you're sighing -- >> under the guise of religion, right. >> i want to talk about something you said. you said this older brother, younger brother relationship. there's something called the sibling effect, brothers committing crimes together.

can you talk to us about that? >> there's been plenty of research to support the fact that a lot ofs a-risk behaviors go viral between siblings, especially if the older one begins it first. research supports early smoking, early onset of sexual behavior. but the data on criminal behavior is all over the math. there's nothing provable. more important is the fact the boys lived together and were very close together, which could happen between two close friends as well. if we look at the columbine shooting. it makes sense if the older one was more the leader. but you can't say that just because they're siblings, crime is contagious. some data supports it. others does not. >> classmates say they were shocked at this, that they could hide their hatred so well, especially the younger brother.

i have to say what they did was horrific. but i've heard some people, especially parents, especially moms say, in some way, i don't understand why the 19-year-old -- in some ways, i feel sorry for him. this is what i'm hearing. he's 19 years old. he's still a kid, he's still a teenager. and they feel that he was influenced by the older boy. does that make sense? >> absolutely. in fact, if you follow twitter, you'll notice a lot of catholics and christians are praying for him as well as praying for the victims of the bombing because there is this sense that maybe he was brainwashed, he was so young. and his older brother may have dominated him. we really don't know and we'll find out information as the weeks go on. >> dr. wendy, thank you. we really appreciate it. >> thanks, don. after a week of pain and heartbreak, celebrations in the streets of boston.

the collective sighs of relief continue today. the scene at fenway park, when we return. with pantene anti-. reduces hair fall up to 97%. get less hair fall. ♪ i took the dare. will you? anti-breakage. pantene.

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i'm don lemon. thanks for joining me. we're going to leave you with the sights and sounds from fenway park this afternoon as the red sox got their chance to help the city get back to a normal routine to blow off some steam and to say thank you. good night, everybody. ♪ >> to seek, find and bring those responsible to justice, the boston marathon volunteers.

♪ o say does that star-spangled banner yet wave ♪ ♪ o'er the land of the free ♪ ♪ and the home of the brave? ♪